1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0eed3b7f69c00c9d91ca4e6fe078782a77eb406c6b60cc54d1940a89d174459. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e134f4e-ba64-483e-b620-c49f88e6b3d3.json and https://artists.proofprofile.net/proofs/artist/4e134f4e-ba64-483e-b620-c49f88e6b3d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0152da883d0dc371881e4cd38500e8599ffffebb2a71e793722c57e107ca1e17. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLZJ2487298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254dafaf2f5e9878483729d2bcc64c4fc44cf3b62a7d55c575c7120d8488ec92. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS642377624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932da513ab4b08cc9492c5d8ced7e2f112cf998b493b2985afd0221e31b86931. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b94e6101ccb9dc89e1c9c470182ffa75d5add2ebe1f6e6db777813ee1fa875. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11e0cae1ec06c26a6651adcb6caed322e4c9049fafb3512f69a03d07c647dbe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334827efcd5234498b3c966275aeeff957101b49caa67d660a93608cdc48f371. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35da48738678e339dbf7fa4a736e8ccb5198f7ad563619917d48e8b6151a2d81. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bac0e44cdc1bb10b67ed5085b70e5855d35bcb06d4f67826c519a03292ac31d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2489108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f1df82e876e737d4e528c295786d092310c6bc68f9def0220820ec2c3b616e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBRKQ2388392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c3c8c0fdf7141d375f5e4d121283bbee19e50ea9071a9e50eff0b6f987c912. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZGLM2338690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de65f22dcb0aac6b4dd10e6600f9f818851800cf26c0b6b2e2cfcb5e45d06ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ5FN2327596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0bf4668cffd515ca4b5c2d402e9e435da6a960e9184ea061a4d182805b52b5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9M2202244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7269f675198af86815217457579653c3475de8d2b58c6f1b707b3214ea64c7a1. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9M2202245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5ef7fd9b213af046ee6033f4b8fc8da15e8632ffb4c279342ce01ef4bc0c3f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9L2209361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4653cedbbf5e3fc4f4e80252067776521f81a8779b1d88cb7859076a8f614a1f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2385388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1b3837cfcd2c3f62c9391b0cdd6f08899eeba98a17aceec6f22468687cee90. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2408747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d0c77e9c0b6b046ab2d29047a187b1dd636f295aeee21258c589f880142b5e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNJW2486382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a35137ea6226e37ae1f21e9c69e68e7444cc461ca1b8a8d11ab197eac4b23d2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ5FN2401076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9071ee8c3bfd705b124e443c843219b8488a1622c906712c2e81385bbd607831. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9K2354225.